I'm just curious, but why the decision to go with 'minmaxboards' vs 'brilliantgameologists'? People aren't necessarily going to make the link between the two things, especially once the old boards go under.
Oh, and what's the deal with the registration process? Is that going to change or stay the same? If it's going to stay the same, it could probably stand to be a bit simpler to work out what you're doing and why. Doesn't have to be confusing to fool general-purpose bots, and if someone purpose builds a bot to spam the site they'll be able to get through regardless.
Some kind of multiple method captcha would probably be better for weeding out spambots.